size(600, 600);
noStroke();
background(128);
fill(255);
ellipse(300,300,600,600);
fill(0);
arc(300,300,600,600,0,PI);
fill(255);
ellipse(150,300,300,300);
fill(0);
ellipse(450,300,300,300);
fill(255);
ellipse(450,300,60,60);
fill(0);
ellipse(150,300,60,60);


